As you are finding, style behavior that is dictated by a style sheet is not "readable" in the same way as styles that are applied using the style="..." inline attribute. However, there is usually a way of reading it.
When an element is drawn on the page it always has height and width and other similar properties (even if they are determined automatically by the browser based on the flow of the page versus being assigned specifically by an inline style or a CSS setting). This values are often available by prefixing "offset" to the style in question. Try using something like this:
You can try the "offset" prefix for other values too:
Hope that works for you.